JP6931337B2 - Registration device, management system, registration method and registration program - Google Patents

Description

The present invention relates to a transaction registration device, a management system, a registration method and a registration program.

Conventionally, a transaction management method using a blockchain has been proposed.
Since the blockchain has the property that once registered transactions cannot be canceled, it is highly resistant to tampering.
Further, in the case of a contract that needs to be canceled under certain conditions in an actual transaction, for example, a cancellation method using HTLC (Hashed Time Lock Control) has been proposed (see, for example, Non-Patent Documents 1 and 2). ).

Bitcoin Wiki, "Hashed Timelock Contracts", [online], September 26, 2017, [Search March 27, 2018], Internet <https: // en. bitcoin. it / wiki / Hashed_Timelock_Controls> Rusty Russell's Coding Blog, "Lightning Networks Part II: Hashes Timelock Contracts (HTLCs)", [online], April 1, 2015, [Search March 27, 2018], Internet <https / https: .. ozlabs. org /? p = 462>

However, in HTLC, the transaction is confirmed when the recipient in the transaction needs to generate a secret random number and the random number is leaked to a third party or the third party can generate this random number by itself. , There was a problem that it could not be canceled.

An object of the present invention is to provide a transaction registration device, a management system, a registration method, and a registration program that can be canceled while using a blockchain.

The transaction registration device according to the present invention is a first registration unit that generates a hash value of a transaction and registers it in a blockchain, and a transmission unit that transmits the transaction to the terminals of the parties to the transaction and requests approval. A receiving unit that receives an electronic signature indicating that the transaction has been approved from the terminal of the party concerned, and a second registration unit that registers the transaction and the electronic signature in the blockchain.

The second registration unit may register a pointer to the hash value together with the transaction and the electronic signature.

The transmitting unit may transmit information for identifying a block storing the hash value to the terminal of the party together with the transaction.

The management system according to the present invention is a system including a transaction transmission terminal and a reception terminal, and a blockchain management device, and the transmission terminal transmits the transaction to the management device and the reception terminal. It includes a transmitting unit, a receiving unit that receives an electronic signature indicating that the transaction has been approved from the receiving terminal, and an instruction unit that instructs the management device to register the transaction with the electronic signature. The receiving terminal includes an approval unit that generates an electronic signature for the transaction received from the transmitting terminal and returns it to the transmitting terminal, and the management device generates a hash value of the transaction and registers it in the blockchain. A first registration unit for registering the transaction and the electronic signature in the blockchain in response to an instruction from the transmission terminal is provided.

In the registration method according to the present invention, a first registration step in which a transaction registration device in a blockchain generates a hash value of the transaction and registers the transaction in the blockchain, and the transaction is transferred to a terminal of a party to the transaction. A transmission step of transmitting and requesting approval, a receiving step of receiving an electronic signature indicating that the transaction has been approved from the terminal of the party, and registration of the transaction and the electronic signature in the blockchain. 2 Perform the registration step and.

The registration program according to the present invention has a first registration step of generating a hash value of the transaction in a device for registering a transaction in the blockchain and registering the transaction in the blockchain, and transmitting the transaction to a terminal of a party to the transaction. A transmission step of transmitting and requesting approval, a receiving step of receiving an electronic signature indicating that the transaction has been approved from the terminal of the party, and registration of the transaction and the electronic signature in the blockchain. 2 The registration step is to be executed.

According to the present invention, it is possible to cancel a transaction while using a blockchain.

It is a figure which shows the functional structure of the management system which concerns on 1st Embodiment. It is a schematic diagram which shows the method of registering a transaction in a blockchain which concerns on 1st Embodiment. It is a sequence diagram which shows the process in the management system which concerns on 1st Embodiment. It is a figure which shows the functional structure of the management system which concerns on 2nd Embodiment. It is a sequence diagram which shows the process in the management system which concerns on 2nd Embodiment.

[First Embodiment]
Hereinafter, the first embodiment of the present invention will be described.

FIG. 1 is a diagram showing a functional configuration of the management system 1 according to the present embodiment.
The management system 1 is composed of a group of terminals that register transactions with respect to the blockchain 10, and includes a transmitting terminal 20 (registration device) and a receiving terminal 30 as parties to the transaction.
There may be a plurality of receiving terminals 30 depending on the type of transaction, but in the present embodiment, the case where the transmitting terminal 20 and the receiving terminal 30 are one by one is illustrated.

The transmission terminal 20 is an information processing device (computer) provided with various input / output interfaces in addition to a control unit and a storage unit. The control unit functions as the following units by reading and executing the software (registered program) stored in the storage unit.
That is, the transmission terminal 20 includes a first registration unit 21, a transmission unit 22, a reception unit 23, and a second registration unit 24.

The first registration unit 21 generates a hash value of the transaction and registers it in the blockchain 10.

The transmission unit 22 transmits the transaction to the receiving terminal 30, which is a party to the transaction, and requests approval.
At this time, the transmission unit 22 transmits information for identifying the block in which the hash value of the transaction is stored in the block chain 10 to the receiving terminal 30 together with the transaction.
The information for identifying the block may be, for example, a block number, a registration date and time, or the like.

The receiving unit 23 receives from the receiving terminal 30 an electronic signature indicating that the recipient of the transaction has approved the contents of the transaction.

The second registration unit 24 registers the transaction and the electronic signature in the blockchain 10.
At this time, the second registration unit 24 clarifies the correspondence between the transaction and the hash value by registering the pointer to the hash value registered by the first registration unit 21 together with the transaction and the electronic signature.

Like the transmitting terminal 20, the receiving terminal 30 is an information processing device (computer) provided with various input / output interfaces in addition to a control unit and a storage unit. The control unit functions as the approval unit 31 by reading and executing the software stored in the storage unit.

The approval unit 31 confirms that the hash value of the transaction received from the transmitting terminal 20 is registered in the blockchain 10, and verifies the validity of the transaction.
Further, when the receiver confirms the content of the received transaction, the approval unit 31 generates an electronic signature for this transaction using the receiver's private key and transmits the electronic signature to the transmitting terminal 20.

FIG. 2 is a schematic diagram showing a method of registering a transaction in the blockchain 10 by the management system 1 according to the present embodiment.
When registering the transaction generated by the transmitting terminal 20 in the blockchain 10, the hash value of the transaction is first calculated and stored in the block 11 of the blockchain 10. As a result, the fact that a contract such as a transaction has occurred is recorded.

Next, when the transaction is approved by the receiving terminal 30, the receiver's electronic signature is transmitted to the transmitting terminal 20 as a sign of approval.
Then, the transaction and the digital signature set are stored in the block 12 of the blockchain 10. At this time, by including the pointer to the block 11 in which the hash value is stored in the block 12, the hash value indicating the fact of the contract and the transaction indicating the entity are associated with each other.

Here, if the receiver does not approve the transaction or the sender ignores the approval result, it can be confirmed that the actual transaction is not stored in the blockchain 10 after the hash value is stored and is canceled.

FIG. 3 is a sequence diagram showing processing in the management system 1 according to the present embodiment.
In step S1, the transmitting terminal 20 generates a transaction.
In step S2, the transmitting terminal 20 calculates the hash value of the generated transaction.
In step S3, the transmitting terminal 20 registers the calculated hash value in the blockchain 10.
In step S4, the transmitting terminal 20 transmits the transaction to the receiving terminal 30.

In step S5, the receiving terminal 30 confirms that the transaction content is correct by input from the receiver, and further confirms that the hash value of the transaction is registered in the blockchain 10.
In step S6, the receiving terminal 30 uses the recipient's private key to generate a digital signature for the transaction.
In step S7, the receiving terminal 30 transmits the generated electronic signature to the transmitting terminal 20.

In step S8, the transmitting terminal 20 registers the transaction and the electronic signature in the blockchain 10.

According to the present embodiment, the management system 1 registers the hash value of the transaction in the blockchain, and after obtaining the approval of the receiver, registers the transaction entity in the blockchain.
Therefore, the management system 1 registers the transaction in the blockchain 10 in two steps, so that the hash value of the transaction indicating the fact of the contract is registered while using the blockchain 10 which is difficult to tamper with. , Transactions can be canceled during various procedures.

As a result, the management system 1 can immediately register the fact that a transaction has occurred at the start of various procedures, so that there is no waiting time until the procedures are completed.
Further, the management system 1 makes it possible to verify the validity of the possibility of falsification by the time the transaction entity is registered by registering the hash value of the transaction in advance.

By registering the pointer to the block in which the hash value is stored together with the transaction entity, the management system 1 can clarify the association between the blocks registered in two steps, and can improve convenience.

Since the management system 1 transmits information for identifying the block in which the hash value is stored to the receiving terminal 30 together with the transaction, the processing load of searching the hash value at the receiving terminal 30 for confirming the validity of the transaction is increased. It will be reduced.

[Second Embodiment]
Hereinafter, a second embodiment of the present invention will be described.
In the present embodiment, the management device 100 of the blockchain 10 is provided, and each terminal accesses the blockchain 10 via the management device 100.
The same reference numerals are given to the same configurations as those in the first embodiment, and the description thereof will be omitted or simplified.

FIG. 4 is a diagram showing a functional configuration of the management system 1A according to the present embodiment.
The management system 1A includes a management device 100 in addition to the transmission terminal 20A and the reception terminal 30.
The transmission terminal 20A includes a transmission unit 22, a reception unit 23, and an instruction unit 25.
The transmission unit 22 transmits the transaction to the management device 100 and the receiving terminal 30.
The receiving unit 23 receives an electronic signature indicating that the transaction has been approved from the receiving terminal 30.
The instruction unit 25 instructs the management device 100 to register the transaction with an electronic signature.

Similar to the first embodiment, the receiving terminal 30 includes an approval unit 31 that generates an electronic signature for a transaction received from the transmitting terminal 20A and returns it to the transmitting terminal 20A.

The management device 100 includes a first registration unit 21 and a second registration unit 24.
The first registration unit 21 generates a hash value of the transaction received from the transmission terminal 20A and registers it in the blockchain 10.
The second registration unit 24 registers the transaction and the electronic signature in the blockchain 10 in response to the instruction from the transmission terminal 20A.

FIG. 5 is a sequence diagram showing processing in the management system 1A according to the present embodiment.
In step S11, the transmitting terminal 20A generates a transaction.
In step S12, the transmitting terminal 20 transmits the generated transaction to the management device 100.

In step S13, the management device 100 calculates the hash value of the transaction received from the transmitting terminal 20A.
In step S14, the management device 100 registers the calculated hash value in the blockchain 10.

In step S15, the transmitting terminal 20A transmits the transaction to the receiving terminal 30.

In step S16, the receiving terminal 30 confirms that the transaction content is correct by input from the receiver, and further confirms that the hash value of the transaction is registered in the blockchain 10 via the management device 100. do.
In step S17, the receiving terminal 30 uses the recipient's private key to generate a digital signature for the transaction.
In step S18, the receiving terminal 30 transmits the generated electronic signature to the transmitting terminal 20A.

In step S19, the transmitting terminal 20A transmits the electronic signature received from the receiving terminal 30 to the management device 100.
In step S20, the management device 100 registers the transaction and the electronic signature in the blockchain 10.

According to the present embodiment, by providing the management device 100 of the blockchain 10, the processing load on the transmission terminal 20A, which is the user's terminal, is reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments. Moreover, the effects described in the above-described embodiments are merely a list of the most preferable effects arising from the present invention, and the effects according to the present invention are not limited to those described in the embodiments.

The transaction registration method by the management system 1 is realized by software. When realized by software, the programs that make up this software are installed in the information processing device (computer). Further, these programs may be recorded on a removable medium such as a CD-ROM and distributed to the user, or may be distributed by being downloaded to the user's computer via a network. Further, these programs may be provided to the user's computer as a Web service via a network without being downloaded.

1,1A management system 10 blockchain 20 receiving terminal 20, 20A transmitting terminal (registration device)
21 1st registration unit 22 Transmission unit 23 Reception unit 24 2nd registration unit 25 Instruction unit 30 Reception terminal 31 Approval unit 100 Management device

Claims (6)

When a transaction occurs, the first registration unit that generates the hash value of the transaction and registers it in the blockchain,
A transmitter that sends the transaction to the terminals of the parties to the transaction and requests approval.
A receiving unit that receives an electronic signature indicating that the validity of the transaction is verified by the hash value and the content of the transaction is approved from the terminal of the party concerned.
A transaction registration device including a second registration unit that registers the approved transaction and the electronic signature in the blockchain. The registration device according to claim 1, wherein the second registration unit registers a pointer to the hash value together with the transaction and the electronic signature. The registration device according to claim 1 or 2, wherein the transmission unit transmits information for identifying a block storing the hash value to the terminal of the party together with the transaction. A management system including a transaction transmission terminal and a reception terminal, and a blockchain management device.
The transmitting terminal is
A transmission unit that transmits the transaction to the management device and the receiving terminal, and
A receiving unit that receives an electronic signature indicating that the transaction has been approved from the receiving terminal.
An instruction unit that instructs the management device to register the transaction with the electronic signature is provided.
The management device is
When the transaction occurs, the first registration unit that generates the hash value of the transaction and registers it in the blockchain,
A second registration unit that registers the approved transaction and the electronic signature in the blockchain in response to an instruction from the transmission terminal is provided.
The receiving terminal is
The validity for the transaction received from the transmitting terminal and verified by the hash value, and, Bei obtain management system authorization unit generates an electronic signature indicates its acceptance of the contents of the transaction, and returns to the transmission terminal .. The transaction registration device in the blockchain
When the transaction occurs, the first registration step of generating the hash value of the transaction and registering it in the blockchain, and
A transmission step of transmitting the transaction to the terminals of the parties to the transaction and requesting approval, and
A receiving step of receiving an electronic signature indicating that the validity of the transaction is verified by the hash value and the content of the transaction is approved from the terminal of the party concerned.
A registration method for executing a second registration step of registering the approved transaction and the electronic signature in the blockchain. In the device for registering transactions in the blockchain,
When the transaction occurs, the first registration step of generating the hash value of the transaction and registering it in the blockchain, and
A transmission step of transmitting the transaction to the terminals of the parties to the transaction and requesting approval, and
A receiving step of receiving an electronic signature indicating that the validity of the transaction is verified by the hash value and the content of the transaction is approved from the terminal of the party concerned.
A registration program for executing a second registration step of registering the approved transaction and the electronic signature in the blockchain.

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